Magnetic reversals in a simple model of MHD

Details Magnetic reversals in a simple model of MHD Magnetic reversals in a simple model of MHD

2009-06-02

arxiv.org/abs/0906.0427v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, submitted to PRL

Scientific paper

We study a simple magnetohydrodynamical approach in which hydrodynamics and MHD turbulence are coupled in a shell model, with given dynamo constrains in the large scales. We consider the case of a low Prandtl number fluid for which the inertial range of the velocity field is much wider than that of the magnetic field. Random reversals of the magnetic field are observed and it shown that the magnetic field has a non trivial evolution linked to the nature of the hydrodynamics turbulence.

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